Ignition-timer



E. B. IACOBSON.

IGNITION TIMER.

APPLICATION FILED Nov.8, 191e.

1,379,821 Patented May 31, 1921. I

UNITED STATES' raTEN'r ortica.

EDWARD BQ JACOBSON, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR T0V J AND B MANUFACTURING COMPANY, OF PITTSFIELD, MASSACHUSETTS, A CORPORA- TION OF MASSACHUSETTS.

IGNITION-TIMER.

Specification of Letters Patent.

Patented May a1, 1921.

Application ined November e, 191s.Y serial No. 261,607.

T 0 all. 107mm a may, concern Be it known that I, EDWARD B. JAooB soN, a citizen of the United States, residing at Pittsfield, in the county of Berkshire and State of Massachusetts, have invented certain new and useful Improvements in Ignition-Timers, of which the following is a specification. n

The present invention particularly concerns improvements in therotor portion 4ot my prior invention as shown and described in U. S. Letters Patent No. 1,188,451, in ignition timers, dated J une 27, 1916, and has for its object to further improve the construction of the contact roll and its mounting whereby the wearing properties of these parts are greatly improved and the timing apparatus as a whole in rendered more durable and etlicient.

lVith the foregoing and other objects i view, the present invention consists in the construction, combination and arrangement of parts, as hereinafter more particularly described and pointed out in the claims.

Referring to the accompanying draw-` ings-Figure 1 is a central vertical section of an ignition timer embodying my present invention and operatively mounted upon a shaft; Fig. 2, a face view of the same, the front portion of the housing being cut away; Fig 3, a side elevation of the housing` housing clamp and clamp support, as-

sembled in operative relation` the rear portion of. the housing being cut awa-y Fig. 4, a side elevation of the rotor carrier; Fig. 5, a front elevation of the same; Fig. 6, a longif tudinal vertical section showing-the method of mounting the rotor carrier on the shaft, the front and rear portions of the' rotor .assembly being cut away Fig. 7 a sectional bottom view of the'contact-arm on a longitudinal curved line; Fig. 8, a longitudinal vert-ical section of the rotor portion operatively mounted, as shown in Fig. 1 Fig. 9. a vertical cross-section of Athe rotor assembly on a plane coincident with the inner face of the outer radial carrier-arm 20; Fig 10, a side elevation of the rotor assembly, Figs. 9and 10 indicating in dotted lines the limit of inward swing ofthe contact-arm; 11,'

vided on the clamp 5.

a side elevation of one of the plates ofthe contact arm; Fig. 12, a similar view of a.

modification; Fig. 13, a side elevation of a modification of. thecontact-roll axial supcylinder explosive engine having a geardriven cam-shaft operated by the main engine shaft, but it should be understood, however, that my invention is applicable for use with motors having any number of ex plosion cylinders, and may be otherwise mounted and driven.

My present invention may be adapted to any suitable form of housingor casing, the form of casing 1 herein illustrated being adjustably mounted on the front end of the engine housing 2 and arranged to inclose a shaft 3, which is preferably geared tothe main engine shaft (not shown) and extends through a suitable opening in the wall of the engine housing.

The rear end of the casing 1 is open and seated ina circular recess 4 provided in the face of the engine housing 2, the wall 'of said recess being 'adapted to prevent eccentric displacement ot the casing. Forward displacement ot the easing 1 is prevented by a spring clamp 5 removably se cured at its rear end to a stud or bolt 6 Xed to the wall of the engine housino- 2, and engaging at its opposite end the i'iont of the casing ul. which is tapered inward and has a central depression to receive a boss 7 pro- Axial movement of the casing 1 for regulating the time of ignition is controlled by va lateral arm 8 exteriorlvmounted on the easing and provided .the primary circuit ot-'separate induction coils.

Mounted to rotate with they shaft 3 within the' casing 1 is a metal carrier 13 in the form of a sleeve which is normally secured aga-inst axial movement on the shaft by a transversely arranged removable pin 14 projecting through the shaft and extending at opposite ends into slots 15, 15, rovided on the outer rim ofA the carrier. he pin 14 is secured against end-wise displacement by a shouldered washer -16 fitted over the outer' end of the carrier and extending over,

, the ends of the pin 14, the reduced outer end parallel in spaced relation to each other and pivotally supporting at their outer ends a contact-arm comprising lpreferably a pair of oppositely arranged'plates21, 21, secured at their rear ends to the carrier arms 20, 20, by a transversely arrancred pin 22. Said pin 22 has reduced extensions 23, 23, atopposite ends adapted to fit into suitable openings 24 in the'plates 21, 2 1, projecting slightly beyond the same and burred at their extremities to prevent,lateral displacement of the plates. As shown, the relative osition of the plates 21, 21, is maintaineld by a transverse spacer-pin 25 which is preferably arranged lat a middle point on the -plates and secured thereto in a manner similar to the pin 22, transverse openings 26 adapted to receive the reduced extremities 27 of the spacer-pin being provided in the plates. o

Supported in the jaw formed by the outer ends of the plates 21, 21, is a brush or contact-roll 28 loosely mounted upon a hardened steel bushing 29 carried on a stationary axle pin 3,()v similar to the contact-arm supporting pin 22 and spacer-pin 25 and secured preferably ina similar manner, to the plates 21, 21, which are provided with suitable transverse openings 31 to receive the reduced extremities 32, 32, of the axle pin which are burred over the plates and secure the bushing 29 iirmly in a stationary position.

In my prior invention, as .shown and described in the patent above' referred to, the contact-roll was mounted directly upon the axle pin which wasconstructed of less durable material than the contact-roll and `without an intervening element such as the pres ent hardened bushing 29. This construction resulted in undue wear of the pin, causing oscillation of the contact-roll yand irregularities in the circuit connections.

Thile I deem the provision of a separate intermediate lmember of hardened metal, such as the bjishing 29, best adapted to prevent rapid and uneven wear of the axial metal having a reduced extension 35 at eachy end adapted to fit into suitable slots36 provided in the outer ends of the side plates/ "77,5

and having corresponding flat faces to prevent rotation of the pin.

The free end of the contact-arm is normally impelled outward yinto movable eny gagement withtheiinsulation ring 10 and contacts 11 under the impulse of a torsion spring 37 carried on the contact-arm supporting pin 22 between the arms 20, 20, one

end of the spring being extended forward to bear preferably against the underside of the spacer-pin 25 while the opposite end of the spring'is extended downward for engagement with the carrier 13, thereby fixing the reflex and expansion limits of the spring torsion. The outwardjswing of the contactarm assembly is limited positively, preferso y.

ably by means of shoulders 38, 38, provided on the outer side of the carrier arms 20, 20, near their bases, and forming stops for engagement by the plates 21, 21, at a predetermined point in the arc of swing of the contact-arm, (see Fig. 10) the lower rim of the plates being preferably extended downward at their rearN ends to\ form a foot 39, 39. The general .operation of the present invention, taken in connection with the description contained inthe specication of my said' prior invention, will be readily understood. s

What I claim as new, and desire to secure by Letters-Patent, is:

1. In a device of the class described, a support, a contact-member mounted thereon and movable relatively thereto, and a hardened" metallic bearing member rigidly mounted on said support and interposed between saidsupport and the contact-member and'ada'pted to maintain the axis of saidV contact-member in constant parallel relation to said support.

2. An ignition timer having a rotor mounted to rotate and having a jaw, a roller mounted in and arranged to travel with said jaw, and a unitary roller journal comprising a single hardened journal bearing member and means independent of the bearing member to retain the latter in stationary position in said jaw and to support the roller.

3. An ignition timer having a rotor mounted to rotate and having apertured jaw members 21, a roller 28 mounted4 on and arranged to travel with said jaw members,

and a 'roller journal Comprising a pin 30 In testimony whereof l hereunto afx my extendlng at opposlte ends into and secured signature in the presence of two Witnesses.

in xed relation to said jaw members and a bushing 29'mounted n stationary position EDXVARD B JAGOBSON' on the pin and forming a hardened en- Witnesses: fj/

gaging bearing medium for the support of' Y JNO'. J. WHI'ITLESEY,

- the roller, A LE ROY E. SHAW. .Y 

